398375287 has 2 divisors, whose sum is σ = 398375288. Its totient is φ = 398375286.

The previous prime is 398375273. The next prime is 398375317. The reversal of 398375287 is 782573893.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 398375287 - 2¹⁵ = 398342519 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398375207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199187643 + 199187644.

It is an arithmetic number, because the mean of its divisors is an integer number (199187644).

Almost surely, 2^398375287 is an apocalyptic number.

398375287 is a deficient number, since it is larger than the sum of its proper divisors (1).

398375287 is an equidigital number, since it uses as much as digits as its factorization.

398375287 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2540160, while the sum is 52.

The square root of 398375287 is about 19959.3408458296. The cubic root of 398375287 is about 735.8073637065.

The spelling of 398375287 in words is "three hundred ninety-eight million, three hundred seventy-five thousand, two hundred eighty-seven".